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          LV17-01-输入类设备-04-触摸屏应用开发实例
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<details class="folding-tag" blue><summary> 点击查看使用工具及版本 </summary>
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              <table>    <tr>        <td align="center" rowspan="5">PC端开发环境</td>        <td align="center" width=150px>Windows</td>        <td align="left">Windows11</td>    </tr>    <tr>        <td align="center">Ubuntu</td>        <td align="left">Ubuntu20.04.2的64位版本</td>      </tr>    <tr>        <td align="center">VMware® Workstation 17 Pro</td>        <td align="left">17.6.0 build-24238078</td>      </tr>    <tr>        <td align="center">终端软件</td>        <td align="left">MobaXterm(Professional Edition v23.0 Build 5042 (license))</td>    </tr>    <tr>        <td align="center">Win32DiskImager</td>        <td align="left">Win32DiskImager v1.0</td>      </tr>    <tr>        <td align="center" rowspan="3">Linux开发板环境</td>        <td align="center">Linux开发板</td>        <td align="left">正点原子 i.MX6ULL Linux 阿尔法开发板</td>      </tr>    <tr>        <td align="center">uboot</td>        <td align="left">NXP官方提供的uboot，NXP提供的版本为uboot-imx-rel_imx_4.1.15_2.1.0_ga(使用的uboot版本为U-Boot 2016.03)</td>      </tr>    <tr>        <td align="center">linux内核</td>        <td align="left">linux-4.15(NXP官方提供)</td>      </tr></table>
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            </details>

<details class="folding-tag" blue><summary> 点击查看本文参考资料 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="5">官方网站</td>        <td align="left"><a href="https://www.arm.com/" target="_blank">https://www.arm.com/</a></td>        <td align="left">ARM官方网站，在这里我们可以找到Cotex-Mx以及ARMVx的一些文档</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/" target="_blank">https://www.nxp.com.cn/ </a></td>        <td align="left">NXP官方网站</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxpic.org.cn/" target="_blank">https://www.nxpic.org.cn/</a></td><td align="left">NXP 官方社区</td>    </tr>    <tr>        <td align="left"><a href="https://u-boot.readthedocs.io/en/latest/" target="_blank">https://u-boot.readthedocs.io/en/latest/</a></td><td align="left">u-boot官网</td>    </tr>    <tr>        <td align="left"><a href="https://www.kernel.org/" target="_blank">https://www.kernel.org/</a></td><td align="left">linux内核官网</td>    </tr>    <tr>        <td align="center" rowspan="5">其他网站</td>        <td align="left"><a href="https://elixir.bootlin.com/linux/v4.15/source/kernel" target="_blank">kernel - Linux source code (v4.15) - Bootlin</a></td>        <td align="left">linux内核源码在线查看</td>    </tr></table>
              </div>
            </details>

<details class="folding-tag" blue><summary> 点击查看相关文件下载 </summary>
              <div class='content'>
              <table>    <tr>        <td align="center">分类</td>        <td align="center">网址</td>        <td align="center">说明</td>    </tr>    <tr>        <td align="center" rowspan="4">NXP</td>        <td align="left"><a href="https://github.com/nxp-imx" target="_blank">https://github.com/nxp-imx</a></td>        <td align="left">NXP imx开发资源GitHub组织，里边会有u-boot和linux内核的仓库</td>    </tr>    <tr>        <td align="left"><a href="https://elixir.bootlin.com/linux/latest/source" target="_blank">https://elixir.bootlin.com/linux/latest/source</a></td>        <td align="left">在线阅读linux kernel源码</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/linux-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga" target="_blank">nxp-imx/linux-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga</a></td>        <td align="left">NXP linux内核仓库tags中的rel_imx_4.1.15_2.1.0_ga</td>    </tr>    <tr>        <td align="left"><a href="https://github.com/nxp-imx/uboot-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga" target="_blank">nxp-imx/uboot-imx/releases/tag/rel_imx_4.1.15_2.1.0_ga</a></td>        <td align="left">NXP u-boot仓库tags中的rel_imx_4.1.15_2.1.0_ga</td>    </tr>    <tr>        <td align="center" rowspan="2">I.MX6ULL</td>        <td align="left"><a href="https://www.nxp.com.cn/docs/en/data-sheet/IMX6ULLIEC.pdf" target="_blank">i.MX 6ULL Applications Processors for Industrial Products</a></td>        <td align="left">I.MX6ULL 芯片手册（datasheet，可以在线查看）</td>    </tr>    <tr>        <td align="left"><a href="https://www.nxp.com.cn/webapp/Download?colCode=IMX6ULLRM&lang_cd=zh" target="_blank">i.MX 6ULL Applications ProcessorReference Manual</a></td>        <td align="left">I.MX6ULL 参考手册（下载后才能查看，需要登录NXP官网）</td>    </tr></table>
              </div>
            </details>

<h1 id="一、获取触摸屏点数"><a href="#一、获取触摸屏点数" class="headerlink" title="一、获取触摸屏点数"></a><font size=3>一、获取触摸屏点数</font></h1><h2 id="1-代码编写"><a href="#1-代码编写" class="headerlink" title="1. 代码编写"></a><font size=3>1. 代码编写</font></h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/** =====================================================</span></span><br><span class="line"><span class="comment"> * Copyright © hk. 2022-2025. All rights reserved.</span></span><br><span class="line"><span class="comment"> * File name  : lcd_touch_read_slot.c</span></span><br><span class="line"><span class="comment"> * Author     : 苏木</span></span><br><span class="line"><span class="comment"> * Date       : 2024-09-22</span></span><br><span class="line"><span class="comment"> * Version    : </span></span><br><span class="line"><span class="comment"> * Description: </span></span><br><span class="line"><span class="comment"> * ======================================================</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/input.h&gt;</span></span></span><br><span class="line"></span><br><span class="line"><span class="comment">// /proc/bus/input/devices 命令查看输入事件</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">input_absinfo</span> <span class="title">info</span>;</span></span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line">    <span class="type">int</span> max_slots;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 校验传参 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">2</span> != argc)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>, <span class="string">&quot;usage: %s &lt;input-dev&gt;\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 打开文件 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(argv[<span class="number">1</span>], O_RDONLY)))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 获取slot信息 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; ioctl(fd, EVIOCGABS(ABS_MT_SLOT), &amp;info)) </span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;ioctl error&quot;</span>);</span><br><span class="line">        close(fd);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    max_slots = info.maximum + <span class="number">1</span> - info.minimum;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;max_slots: %d\n&quot;</span>, max_slots);</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 关闭、退出 */</span></span><br><span class="line">    close(fd);</span><br><span class="line">    <span class="built_in">exit</span>(EXIT_SUCCESS);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h2 id="2-开发板测试"><a href="#2-开发板测试" class="headerlink" title="2. 开发板测试"></a><font size=3>2. 开发板测试</font></h2><img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-04-%E8%A7%A6%E6%91%B8%E5%B1%8F%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E5%AE%9E%E4%BE%8B/img/image-20240922095138182.png" alt="image-20240922095138182" style="zoom:50%;" />

<p>可以看到这个是一个5点的触摸屏。</p>
<h1 id="二、单点触摸"><a href="#二、单点触摸" class="headerlink" title="二、单点触摸"></a><font size=3>二、单点触摸</font></h1><p>这里我的触摸屏好像并不会上报按下的这个事件，所以流程与多点触摸一致了，直接看多点触摸的实例。</p>
<h1 id="三、多点触摸"><a href="#三、多点触摸" class="headerlink" title="三、多点触摸"></a><font size=3>三、多点触摸</font></h1><h2 id="1-代码编写-1"><a href="#1-代码编写-1" class="headerlink" title="1. 代码编写"></a><font size=3>1. 代码编写</font></h2><figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br><span class="line">105</span><br><span class="line">106</span><br><span class="line">107</span><br><span class="line">108</span><br><span class="line">109</span><br><span class="line">110</span><br><span class="line">111</span><br><span class="line">112</span><br><span class="line">113</span><br><span class="line">114</span><br><span class="line">115</span><br><span class="line">116</span><br><span class="line">117</span><br><span class="line">118</span><br><span class="line">119</span><br><span class="line">120</span><br><span class="line">121</span><br><span class="line">122</span><br><span class="line">123</span><br><span class="line">124</span><br><span class="line">125</span><br><span class="line">126</span><br><span class="line">127</span><br><span class="line">128</span><br><span class="line">129</span><br><span class="line">130</span><br><span class="line">131</span><br><span class="line">132</span><br><span class="line">133</span><br><span class="line">134</span><br><span class="line">135</span><br><span class="line">136</span><br><span class="line">137</span><br><span class="line">138</span><br><span class="line">139</span><br><span class="line">140</span><br><span class="line">141</span><br><span class="line">142</span><br><span class="line">143</span><br><span class="line">144</span><br><span class="line">145</span><br><span class="line">146</span><br><span class="line">147</span><br><span class="line">148</span><br><span class="line">149</span><br><span class="line">150</span><br><span class="line">151</span><br><span class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdio.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;stdlib.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/types.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/stat.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;fcntl.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;sys/ioctl.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;unistd.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;string.h&gt;</span></span></span><br><span class="line"><span class="meta">#<span class="keyword">include</span> <span class="string">&lt;linux/input.h&gt;</span></span></span><br><span class="line"><span class="comment">/* 用于描述MT多点触摸每一个触摸点的信息 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">ts_mt</span> </span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    <span class="type">int</span> x;      	<span class="comment">//X坐标</span></span><br><span class="line">    <span class="type">int</span> y;      	<span class="comment">//Y坐标</span></span><br><span class="line">    <span class="type">int</span> id;     	<span class="comment">//对应ABS_MT_TRACKING_ID</span></span><br><span class="line">    <span class="type">int</span> valid;		<span class="comment">//数据有效标志位(=1表示触摸点信息发生更新)</span></span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="comment">/* 一个触摸点的x坐标和y坐标 */</span></span><br><span class="line"><span class="class"><span class="keyword">struct</span> <span class="title">tp_xy</span> </span></span><br><span class="line"><span class="class">&#123;</span></span><br><span class="line">    <span class="type">int</span> x;</span><br><span class="line">    <span class="type">int</span> y;</span><br><span class="line">&#125;;</span><br><span class="line"></span><br><span class="line"><span class="type">static</span> <span class="type">int</span> <span class="title function_">ts_read</span><span class="params">(<span class="type">const</span> <span class="type">int</span> fd, <span class="type">const</span> <span class="type">int</span> max_slots, <span class="keyword">struct</span> ts_mt *mt)</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">input_event</span> <span class="title">in_ev</span> =</span> &#123;&#123;<span class="number">0</span>&#125;&#125;;</span><br><span class="line">    <span class="type">static</span> <span class="type">int</span> slot = <span class="number">0</span>;<span class="comment">//用于保存上一个slot</span></span><br><span class="line">    <span class="type">static</span> <span class="class"><span class="keyword">struct</span> <span class="title">tp_xy</span> <span class="title">xy</span>[12] =</span> &#123;&#123;<span class="number">0</span>&#125;&#125;;<span class="comment">//用于保存上一次的x和y坐标值,假设触摸屏支持的最大触摸点数不会超过12</span></span><br><span class="line">    <span class="type">int</span> i = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 对缓冲区初始化操作 */</span></span><br><span class="line">    <span class="built_in">memset</span>(mt, <span class="number">0x0</span>, max_slots * <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ts_mt));  <span class="comment">//清零</span></span><br><span class="line">    <span class="keyword">for</span> (i = <span class="number">0</span>; i &lt; max_slots; i++)</span><br><span class="line">    &#123;</span><br><span class="line">        mt[i].id = <span class="number">-2</span>;<span class="comment">//将id初始化为-2, id=-1表示触摸点删除, id&gt;=0表示创建</span></span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="keyword">while</span>(<span class="number">1</span>)</span><br><span class="line">    &#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (<span class="keyword">sizeof</span>(<span class="keyword">struct</span> input_event) != read(fd, &amp;in_ev, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> input_event))) </span><br><span class="line">        &#123;</span><br><span class="line">            perror(<span class="string">&quot;read error&quot;</span>);</span><br><span class="line">            <span class="keyword">return</span> <span class="number">-1</span>;</span><br><span class="line">        &#125;</span><br><span class="line">        <span class="meta">#<span class="keyword">if</span> 1</span></span><br><span class="line">        <span class="built_in">printf</span>(<span class="string">&quot;[INFO]event type:%d code:%d value:%d\n&quot;</span>, in_ev.type, in_ev.code, in_ev.value);</span><br><span class="line">        <span class="meta">#<span class="keyword">endif</span></span></span><br><span class="line">        <span class="keyword">switch</span> (in_ev.type) </span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">case</span> EV_ABS:</span><br><span class="line">                <span class="keyword">switch</span> (in_ev.code) </span><br><span class="line">                &#123;</span><br><span class="line">                    <span class="keyword">case</span> ABS_MT_SLOT:</span><br><span class="line">                        slot = in_ev.value;</span><br><span class="line">                        <span class="keyword">break</span>;</span><br><span class="line">                    <span class="keyword">case</span> ABS_MT_POSITION_X:</span><br><span class="line">                        xy[slot].x = in_ev.value;</span><br><span class="line">                        mt[slot].valid = <span class="number">1</span>;</span><br><span class="line">                        <span class="keyword">break</span>;</span><br><span class="line">                    <span class="keyword">case</span> ABS_MT_POSITION_Y:</span><br><span class="line">                        xy[slot].y = in_ev.value;</span><br><span class="line">                        mt[slot].valid = <span class="number">1</span>;</span><br><span class="line">                        <span class="keyword">break</span>;</span><br><span class="line">                    <span class="keyword">case</span> ABS_MT_TRACKING_ID:</span><br><span class="line">                        mt[slot].id = in_ev.value;</span><br><span class="line">                        mt[slot].valid = <span class="number">1</span>;</span><br><span class="line">                        <span class="keyword">break</span>;</span><br><span class="line">                    <span class="keyword">default</span>:</span><br><span class="line">                        <span class="keyword">break</span>;</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">            <span class="comment">//case EV_KEY://按键事件对单点触摸应用比较有用</span></span><br><span class="line">            <span class="comment">//  break;</span></span><br><span class="line">            <span class="keyword">case</span> EV_SYN:</span><br><span class="line">                <span class="keyword">if</span> (SYN_REPORT == in_ev.code) </span><br><span class="line">                &#123;</span><br><span class="line">                    <span class="keyword">for</span> (i = <span class="number">0</span>; i &lt; max_slots; i++) </span><br><span class="line">                    &#123;</span><br><span class="line">                        mt[i].x = xy[i].x;</span><br><span class="line">                        mt[i].y = xy[i].y;</span><br><span class="line">                    &#125;</span><br><span class="line">                &#125;</span><br><span class="line">                <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">            <span class="keyword">default</span>:</span><br><span class="line">                <span class="keyword">break</span>;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line">    <span class="keyword">return</span> <span class="number">0</span>;</span><br><span class="line">&#125;</span><br><span class="line"></span><br><span class="line"><span class="comment">// /proc/bus/input/devices 命令查看输入事件</span></span><br><span class="line"><span class="type">int</span> <span class="title function_">main</span><span class="params">(<span class="type">int</span> argc, <span class="type">char</span> *argv[])</span></span><br><span class="line">&#123;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">input_absinfo</span> <span class="title">slot</span> =</span> &#123;<span class="number">0</span>&#125;;</span><br><span class="line">    <span class="class"><span class="keyword">struct</span> <span class="title">ts_mt</span> *<span class="title">mt</span> =</span> <span class="literal">NULL</span>;</span><br><span class="line">    <span class="type">int</span> max_slots = <span class="number">0</span>;</span><br><span class="line">    <span class="type">int</span> fd = <span class="number">-1</span>;</span><br><span class="line">    <span class="type">int</span> i = <span class="number">0</span>;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 校验传参 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">2</span> != argc)</span><br><span class="line">    &#123;</span><br><span class="line">        <span class="built_in">fprintf</span>(<span class="built_in">stderr</span>, <span class="string">&quot;usage: %s &lt;input-dev&gt;\n&quot;</span>, argv[<span class="number">0</span>]);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 打开文件 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; (fd = open(argv[<span class="number">1</span>], O_RDONLY)))</span><br><span class="line">    &#123;</span><br><span class="line">        perror(<span class="string">&quot;open error&quot;</span>);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 获取触摸屏支持的最大触摸点数 */</span></span><br><span class="line">    <span class="keyword">if</span> (<span class="number">0</span> &gt; ioctl(fd, EVIOCGABS(ABS_MT_SLOT), &amp;slot)) </span><br><span class="line">	&#123;</span><br><span class="line">        perror(<span class="string">&quot;ioctl error&quot;</span>);</span><br><span class="line">        close(fd);</span><br><span class="line">        <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    max_slots = slot.maximum + <span class="number">1</span> - slot.minimum;</span><br><span class="line">    <span class="built_in">printf</span>(<span class="string">&quot;max_slots: %d\n&quot;</span>, max_slots);</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 申请内存空间并清零 */</span></span><br><span class="line">    mt = <span class="built_in">calloc</span>(max_slots, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ts_mt));</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 读数据 */</span></span><br><span class="line">    <span class="keyword">while</span>(<span class="number">1</span>)</span><br><span class="line">    &#123;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">if</span> (<span class="number">0</span> &gt; ts_read(fd, max_slots, mt))</span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">break</span>;</span><br><span class="line">        &#125;</span><br><span class="line"></span><br><span class="line">        <span class="keyword">for</span> (i = <span class="number">0</span>; i &lt; max_slots; i++) </span><br><span class="line">        &#123;</span><br><span class="line">            <span class="keyword">if</span> (mt[i].valid) </span><br><span class="line">            &#123;</span><br><span class="line">                <span class="comment">//判断每一个触摸点信息是否发生更新（关注的信息发生更新）</span></span><br><span class="line">                <span class="keyword">if</span> (<span class="number">0</span> &lt;= mt[i].id)</span><br><span class="line">                    <span class="built_in">printf</span>(<span class="string">&quot;slot&lt;%d&gt;, press(%d, %d)\n&quot;</span>, i, mt[i].x, mt[i].y);</span><br><span class="line">                <span class="keyword">else</span> <span class="keyword">if</span> (<span class="number">-1</span> == mt[i].id)</span><br><span class="line">                    <span class="built_in">printf</span>(<span class="string">&quot;slot&lt;%d&gt;, lift\n&quot;</span>, i);</span><br><span class="line">                <span class="keyword">else</span></span><br><span class="line">                    <span class="built_in">printf</span>(<span class="string">&quot;slot&lt;%d&gt;, move(%d, %d)\n&quot;</span>, i, mt[i].x, mt[i].y);</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/* 关闭设备、退出 */</span></span><br><span class="line">    close(fd);</span><br><span class="line">    <span class="built_in">free</span>(mt);</span><br><span class="line">    <span class="built_in">exit</span>(EXIT_FAILURE);</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>示例代码中定义了 struct ts_mt 数据结构，用于描述多点触摸情况下每一个触摸点的信息。  </p>
<p>首先来看下 main()函数，定义了 max|_slots 变量，用于指定触摸屏设备的支持的最大触摸点数，通过：  </p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">ioctl(fd, EVIOCGABS(ABS_MT_SLOT), &amp;slot)</span><br></pre></td></tr></table></figure>

<p>获取到触摸屏该信息。</p>
<p>接着根据 max_slots 变量的值，为 mt 指针申请内存：  </p>
<figure class="highlight c"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mt = <span class="built_in">calloc</span>(max_slots, <span class="keyword">sizeof</span>(<span class="keyword">struct</span> ts_mt));</span><br></pre></td></tr></table></figure>

<p>while循环中调用 ts_read()函数，该函数是自定义函数，用于获取触摸屏上报的数据， 第一个参数表示文件描述符 fd、第二个参数表示触摸屏支持的最大触摸点数、第三个参数则是 struct ts_mt 数组， ts_read()函数会将获取到的数据存放在数组中， mt[0]表示 slot&lt;0&gt;数据、 mt[1]表示 slot&lt;1&gt;的数据依次类推。</p>
<p>在内部的 for 循环中，则对获取到的数据进行分析，判断数据是否有效，并根据 id 判断手指的动作，在单点触摸应用程序中，我们是通过 BTN_TOUCH 事件来判断手指的动作；而在多点触摸应用中，我们需要通过 id 来判断多个手指的动作。 </p>
<h2 id="2-开发板测试-1"><a href="#2-开发板测试-1" class="headerlink" title="2. 开发板测试"></a><font size=3>2. 开发板测试</font></h2><p>我们编译后执行，然后多个手指按下的时候会有如下打印：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-04-%E8%A7%A6%E6%91%B8%E5%B1%8F%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E5%AE%9E%E4%BE%8B/img/image-20240922212310023.png" alt="image-20240922212310023" style="zoom:50%;" />

<p>上图是按下和移动的打印信息，当手指拿开的时候如下：</p>
<img data-src="https://fanhua-picture.oss-cn-hangzhou.aliyuncs.com/01%E5%B5%8C%E5%85%A5%E5%BC%8F%E5%BC%80%E5%8F%91/02IMX6ULL%E5%B9%B3%E5%8F%B0/LV03-%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91/LV17-01-%E8%BE%93%E5%85%A5%E7%B1%BB%E8%AE%BE%E5%A4%87-04-%E8%A7%A6%E6%91%B8%E5%B1%8F%E5%BA%94%E7%94%A8%E5%BC%80%E5%8F%91%E5%AE%9E%E4%BE%8B/img/image-20240922212353769.png" alt="image-20240922212353769" style="zoom:50%;" />

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